Introduction: Arduino - Line Follower Robot

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Arduino Project Tutorial Line Follower Robot - For beginners

In this tutorial, you will make line follower robot.

Step 1: Video Tutorial

This tutorial involves building a line follower robot with an QTR-8RC Reflectance Sensor Array.

Step 2: Hardware Required

  • Arduino Board
  • Motor Shield (Adafruit)
  • QTR-8RC Reflectance Sensor Array (Pololu)
  • DC Motor x2
  • Wheel x2
  • Bovine Wheel
  • Chassis plate
  • Battery 9V
  • Battery Buckle
  • Wires
  • Button
  • Glue Gun
  • Electrical Tape

Step 3: Create of the Chassis

  1. The DC motors attach to the chassis
  2. The Arduino attach to the chassis
  3. The Motor Shield attach to the Arduino.
  4. The Bovine Wheel attach to the chassis
  5. Wheels attach to the DC Motors

Step 4: About the Motor Shield

  • The motor controllers on this shield are designed to run from 4.5V to 25V.
  • There are two places you can get your motor 'high voltage supply' from. One is the DC jack on the Arduino board and the other is the 2-terminal block on the shield that is labeled EXT_PWR.
  • To connect a motor, simply solder two wires to the terminals and then connect them to either the M1, M2, M3, or M4.

Step 5: DC Motors and the QTR-8RC Sensor Connections

  1. DC Motors connect to the Motor Shield
  2. Left Motor connect to M1 - Right Motor connect to M2
  3. The QTR-8RC Reflectance Sensor Connections

  • The Sensor VCC connect to the Arduino +5V
  • The Sensor GND connect to the Arduino Ground
  • The Sensor pin 2 connect to the Arduino Analog 0
  • The Sensor pin 3 connect to the Arduino Analog 1
  • The Sensor pin 4 connect to the Arduino Analog 2
  • The Sensor pin 5 connect to the Arduino Analog 3
  • The Sensor pin 6 connect to the Arduino Analog 4
  • The QTR-8RC Reflectance Sensor attach to the chassis

Step 6: Battery and on / Off Button Connection

  • The (+) from the battery is connect to a leg of the button
  • Connect a cable to the other legs of the button. This cable is for Motor Shield (+)
  • If you would like to have 2 seperate DC power supplies for the Arduino and motors. Plug in the supply for the Arduino into the DC jack, and connect the motor supply to the PWR_EXT block. Make sure the jumper is removed from the motor shield.

Step 7: Copy the Code and Install the Arduino Libraries

  • Uncompress the ZIP file onto your desktop
  • Place the AFMotor folder into your arduinosketchfolder/libraries folder
  • Rename the uncompressed folder AFMotor
  • Install the QTRSensors library
  • Download the library
  • Rename the folder “qtr-sensors-arduino-xxxx” to “QTRSensors”

  • Drag the “QTRSensors” folder into the “libraries” directory inside your Arduino sketchbook directory

  • After installing the library, restart the Arduino IDE
  • Now you can see the libraries you have installed
  • When you verify, you will not see any errors

Step 8: If It Helps, Please Subscribe

First of all, I would like to thank you for reading this guide ! I hope it helps you.

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